... . Wide viewing field. High precision coated optics with variable zoom function, central focusing wheel, soft-grip protective housing and ... : 10-30XObjective lens diameter: 50mmEye relief : 14mmWeight : 830gFeatures:Zoom 10x to 30x and any power in between Great binoculars ... Includes carrying case, lens caps, and lens cleaning cloth Tripod socket for stationary use Large 50mm front objective diameter ...